diff --git a/install-dev/php/drop_image_type_non_unique_index.php b/install-dev/php/drop_image_type_non_unique_index.php
new file mode 100644
index 000000000..4f316b43e
--- /dev/null
+++ b/install-dev/php/drop_image_type_non_unique_index.php
@@ -0,0 +1,8 @@
+<?php
+
+function drop_image_type_non_unique_index()
+{
+	$index = Db::getInstance()->executeS('SHOW index FROM ps_image_type where column_name = "name" and non_unique=1');
+	// do not use pSql, this function is not defined
+	Db::getInstance()->execute('ALTER TABLE `PREFIX_image_type` DROP INDEX "'.$index.'"');
+}